What is the voltage in a circuit that has a current of 10.0 amps and a resistance of 28.5 ohms?
A.
2.85 volts
B.
285 volts
C.
0.35 volts
D.
18.5 volts

Answer:

At point A, the comet has the least kinetic energy because the comet is resting. 3. From point B to point D its orbit's potential energy is decreasing and its kinetic energy is increasing meaning it's moving more and more

Answer:

•Walking briskly

• Running /jogging

•Dancing

•biking

The lamp descends with the elevator so its acceleration is also 2.9 m/s². Take downward to be the positive direction. Then the net force on the lamp is

∑ F = w - t = ma

where w = mg = weight of lamp, t = tension in the cord, m = mass of lamp, and a = acceleration. Then

mg - t = ma

mg - ma = t

m (g - a) = t

m = t / (g - a)

so that the lamp's mass is

m = (52 N) / (9.8 m/s² - 2.9 m/s²) ≈ 7.5 kg

Answer:

the focal length of this combination is -93.33 cm

Explanation:

To find the focal length of the combination of two thin lenses in contact, we can use the formula:

1/f = 1/f1 + 1/f2 - d/f1f2

Where f is the focal length of the combination, f1 and f2 are the focal lengths of the two lenses, and d is the distance between the lenses.

In this case, the lenses are in contact, so the distance between them is zero. Therefore, the formula simplifies to:

1/f = 1/f1 + 1/f2

Substituting the given values, we get:

1/f = 1/28.0 cm + 1/-43.0 cm

Simplifying this expression gives us:

1/f = -0.0107143 cm^-1

Multiplying both sides by -1 gives:

-1/f = 0.0107143 cm^-1

Therefore, the focal length of the combination of the two lenses is:

f = -93.33 cm

Note that the negative sign indicates that the combination acts as a diverging lens.

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Let consider the whole system to be at equilibrium where the net force is zero. The forces \(F_A\) and \(F_B\) are acting in the upward direction while the weight (w) of the crate is acting in the downward direction.

The force at equilibrium in the y-direction is computed as:

\(\sum F_y = ma_y\)

\(F_A +F_B= mg\)

\(\mathbf{F_A = mg -F_B}\)  ---- (1)

Recall that the weight w = mg

where;

w = 200 × 9.8

w = 1960 N

The torque about the bottom end is also zero. i.e.

\(\sum \tau=0\)

∴

\(F_B L_Z - wL_w = 0\) --- (2)

\(F_B L_Z= wL_w\)

\(F_B = \omega (\dfrac{L_w}{L_z})\)

\(F_B =1960\times (\dfrac{0.375\times cos 45^0}{1.25\times cos 45^0})\)

\(F_B =1960\times (0.3)\)

\(\mathsf{F_B = 588 \ N}\)

Replacing the value for the force of B into equation (1); we have:

\(F_A = mg - F_B\)

\(F_A = 1960 - 588\)

\(\mathsf{F_A = 1372 N}\)

Thus, we can conclude that the magnitude of these forces i.e force B and force A are 588 N and 1372 N respectively.

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Option C, its speed doubled, and the acceleration and kinetic energy remain the same.

The momentum of a truck is the product of its mass and velocity. If the momentum of the truck is increased by a factor of 2, then its velocity must also increase by a factor of 2 to maintain the same mass. This means that option C, its speed doubled, is correct.
Acceleration is the rate at which an object's velocity changes over time. It is directly proportional to the net force acting on an object and inversely proportional to its mass. Therefore, if the weight of the truck does not change, its acceleration will not change either, making option A incorrect.
On the other hand, the kinetic energy of an object is directly proportional to its mass and the square of its velocity. Therefore, if the velocity of the truck doubles, its kinetic energy will increase by a factor of 4. This means that option D, its kinetic energy doubled, is also incorrect.

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If you'll looking for a metal that melts at exactly 1000 degrees celcius, then Red Brass melts at exactly 1000 degrees celcius

The person who would have more kinetic energy between the man and the son, would be the man.

The man and the boy can have the same kinetic energy if the son was running faster than his father.

Since the man has a greater mass than his son and they are running at the same speed, the man will have more kinetic energy. This is because the kinetic energy is directly proportional to the mass when the velocity is constant.

For them to have the same kinetic, the son would have to run at a higher speed than the man, so that the product of 0.5 * mass * speed^2 is equal for both of them. In other words, the smaller mass of the son would need to be compensated for by a higher velocity (speed), resulting in equal kinetic energy.

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The electrical potential between the anode and the cathode alters when a charged particle enters the tube. This shift in voltage in the electrical circuit results from the potential change in the tube and counts as a change.

When radiation strikes the gas inside the tube, it dislodges an electron from the gas particle and produces an ion pair. The tube's centre has a filament that draws electrons.

The ionisation process is used by a Geiger counter to measure and identify radiation. The chamber of the gadget contains a stable gas. This gas ionises when subjected to radioactive particles.

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Answer:

5 bricks.

Explanation:

Comment

This is the kind of question where you have to invent your own formula. It is not obvious what to do.

Formula

Ff (frictional force) = mu (coeficient of friction) * weight of 1 brick * Number needed.

FF(friction force) = mu * weight 1 brick * number of bricks.

Givens

ff = 80 N

mu = 0.8

Brick weight (1 brick) = 20N

n is the number of bricks needed.

Solution

Ff = mu * weight 1 brick * number of bricks   Substitute the givens

80 = 0.8 * 20N * n                                            n is the number of bricks

80 = 16 * n                                                        Divide by 16

80/16 = 16*n/16

5 = n

You have to add 5 bricks.

Answer:

it is used because

They are also less likely to jam due to rust in the screw thread.

Hydraulic jacks are often used to lift elevators in low and medium rise buildings.

A hydraulic jack uses a liquid that is forced into a cylinder by a pump plunger.

The energy of the sun Is a response for the life on earth The planet might take a seat down withinside the liveable radius starting from 0. eighty-five AU to two AU.

The large the planet quicker will be the rotation speed, and therefore shortest the time to take rotate across the axis. The large planets are exceedingly greater solid whilst as compared to the small planet system.

The hazards are

• With improved size, the quantity of gravitational enchantment posed via way of means of the planet might additionally increase. This might cause attracting outer area asteroids and consequential crater impact.

• The large the size, the farther it'd be from the big name to atone for the hydrostatic balance, hence reducing the possibilities for it being an inhabitable area.

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Answer:

ductility

Explanation

flattening of a metal to form a sheet

Answer:

Explanation:

We need the power equation here, which is:

Power = (F * Δx)/time

where F * Δx is the amount of work done.

F is a force which is measured in Newtons. We are given the mass of the object, but since we need a Force measure, we need the weight of the object:

F = 2100(9.0)

F = 21000 to the correct number of sig dig.

Now we can plug in the values we have and solve for the displacement, Δx:

\(45000=\frac{21000x}{17.4}\) and isolating x:

\(\frac{17.4(45000)}{21000}=x\) so

x = 37 m

2 x 10⁻¹⁸ C is the charge on each of the pieces.

In physics, Charge is electric charge, electrical charge, or electrostatic charge and symbolized as q, is a characteristic of a unit of matter that expresses the extent to which it has more or fewer electrons than protons.

According to the question,

Fс = 4 x 10⁻²³ N

d = 0.03 m  , k = 9.0 x 10⁹ N·m²/C²

q =?

The force exerted by one charge q on another charge Q a distance r away is given by:

Coulomb's law:

Fc =\(\frac{kq_{1} q_{2} }{d^{2} }\)

By solving the equation:

\(q1q2 =\frac{F_{c} d^{2} }{k}\)

\(\frac{(4*10^{-23}(0.03m )^{2} }{(9.0*10^{9}N.m^{2}/C^{2}) }\)

= 4 x 10 ⁻³⁶C²

This is the square of the charge on the pieces of puffed rice.

Now, to find the charge on one piece of puffed rice,

take the square root of this number.

q = √4 x 10⁻³⁶ C²

q = 2 x 10⁻¹⁸ C

Therefore,

The charge on each of the pieces is 2 x 10⁻¹⁸ C

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Answer:

Mass = 0.04 Kg

Explanation:

Given the following data;

Density = 800 kg/m³

Volume = 5 * 10^{-5} m³

To find the mass of the object;

Density can be defined as mass all over the volume of an object.

Simply stated, density is mass per unit volume of an object.

Mathematically, density is given by the formula;

\( Density = \frac {mass}{volume} \)

Making mass the subject of formula, we have;

\( Mass = density * volume \)

Substituting the values into the formula, we have;

\( Mass = 800 * 5 * 10^{-5} \)

Mass = 0.04 Kg

All points on the object have the same centripetal acceleration.
The net external torque on the object is constant.


Centripetal acceleration is the acceleration directed towards the center of the circular path. In the case of a rigid object rotating with a constant angular velocity, all points on the object travel in circular paths with the same angular velocity, so they must also have the same centripetal acceleration. Therefore, the statement "All points on the object have the same centripetal acceleration" is true.

According to Newton's second law of motion, the net external force acting on an object is equal to the product of its mass and acceleration. In the case of a rigid object rotating with a constant angular velocity, the angular velocity and hence the angular acceleration are constant, so there must be a net external torque acting on the object to maintain this motion. Therefore, the statement "The net external torque on the object is constant" is true.

When a rigid object rotates with a constant angular velocity, all points on the object have the same centripetal acceleration, and the net external torque on the object is constant.

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Answer:

R=60Ω

Explanation:

You are looking for the total resistance of a parallel circuit so the formula is

R=R1+R2+R3, where R1=10Ω, R2=20Ωand R3=30Ω

R=10Ω+20Ω+30Ω

R=60Ω

Answer:

The last option

Explanation:

Answer:

A

Explanation:

In a physics lab experiment, a spring clamped to a table shoots a 20 g ball horizontally. When the spring is compressed by 20 cm, the ball travels horizontally for a distance of 5.0 m and lands on the floor 1.5 m below the point of release.

To determine the spring constant, we can use the principles of energy conservation. The potential energy stored in the spring when it is compressed is converted into the kinetic energy of the ball when it is released. This kinetic energy then translates into the ball's horizontal motion.

First, we can calculate the potential energy stored in the spring using the equation U = (1/2)kx², where U is the potential energy, k is the spring constant, and x is the displacement of the spring (20 cm = 0.2 m).

Next, we equate the potential energy to the kinetic energy of the ball using the equation KE = (1/2)mv², where KE is the kinetic energy, m is the mass of the ball (20 g = 0.02 kg), and v is the horizontal velocity of the ball.

Since the ball lands on the floor 1.5 m below the release point, we can use the equation for vertical displacement to find the time of flight t: h = (1/2)gt², where h is the vertical displacement (1.5 m) and g is the acceleration due to gravity.

Using the time of flight t, we can find the horizontal velocity v = 5.0 m / t.

Finally, by equating the potential energy to the kinetic energy and substituting the calculated values, we can solve for the spring constant k.

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Answer:

Total mechanical energy = 225 J

Explanation:

Given:

Mass of duck (m) = 2 kg

Speed of duck (v)= 5 m/s

Height of duck from ground (h) = 10 m

Gravitation acceleration (g) = 10 m/s²

Find:

Total mechanical energy

Computation:

Total mechanical energy = Kinetic energy + Potential energy

Total mechanical energy = (1/2)mv² + mgh

Total mechanical energy = (1/2)(2)(5)² + (2)(10)(10)

Total mechanical energy = 25 + 200

Total mechanical energy = 225 J

Answer:

stellar fusion

Explanation:

formation of moons expansion of the universe formation of stars, formation of planets, formation of nebulae

The force needed to give a car of mass 800 kg an acceleration of 2.0 ms-² is 1600N.

The force needed to push an object can be calculated by multiplying the mass of the object by its acceleration as follows:

Force = mass × acceleration

According to this question, a car of mass 800 kg has an acceleration of 2.0 ms−². The force is calculated as follows:

Force = 800kg × 2m/s²

Force = 1600N

Therefore, the force needed to give a car of mass 800 kg an acceleration of 2.0 ms-² is 1600N.

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Answer: temperature goes with the heat can you follow add me and heart me like me and can I get my 20 points

Explanation:

Thermal energy (also called heat energy) is produced when a rise in temperature causes atoms and molecules to move faster and collide with each other. The energy that comes from the temperature of the heated substance is called thermal energy

Answer:

x = 5[km]

Explanation:

We must convert the time from minutes to hours.

\(t=30[min]*\frac{1h}{60min}= 0.5[h]\\\)

We know that speed is defined as the relationship between space and time.

\(v=x/t\)

where:

x = space [m]

t = time = 0.5 [h]

v = velocity [m/s]

Now replacing:

\(x = 10[\frac{km}{h} ]*0.5[h]\\x=5[km]\)

Answer:

Big Q represents the source charge which creates the electric field. Little q represents the test charge which is used to measure the strength of the electric field at a given location surrounding the source charge.

The source charge, or Big Q, is what generates the electric field. Little q stands for the test charge, that is used to gauge the intensity of the electromagnetic field around the source charge at a certain position.

Charged material experiences a force when it is exposed to an electromagnetic field because of the physical characteristic of electric charge.

You can have a positive or negative electric charge. Unlike charges attract one another, while like charges repel one another. Neutral refers to an object that carries no net charge.

Classical electrodynamics, the name given to early understanding of how charged particles interact, is still accurate for issues that do not call for taking into account quantum phenomena.

Electric current is a conserved attribute, meaning that the net charge—that is, the sum of the positive and negative charges in an isolated system—cannot change.

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Answer:

S = V0 t + 1/2 a t^2      net distance traveled

5.2 = a/2 * 25

a = 10.4 / 25 = ,416 m / s^2

F = m * a

m = F / a = 24 / .416 = 57.7 N

A driver have to stop for a school bus when the red lights are flashing and there is no barrier between his/her vehicle and the bus.

Traffic rules are rules that are expected to follow by the road users for the safety of everyone using the road.

For instance, when the red lights are flashing , it simply means to stop, while the green light means that the vehicle can continue to move, and yellow light means to be at alert to move.

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Answer: